问题描述

新手求助:filter过滤器的问题

web.xml配置

<filter>
        <filter-name>loginInterceptor</filter-name>
        <filter-class>com.cbt.Interceptor.LoginInterceptor</filter-class>
        <init-param>
            <param-name>loginPage</param-name>
            <param-value>main_login</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>loginInterceptor</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>loginInterceptor</filter-name>
        <url-pattern>*.jsp</url-pattern>
    </filter-mapping>
    <filter-mapping>
        <filter-name>loginInterceptor</filter-name>
        <url-pattern>*.html</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>cbtconsole</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>cbtconsole</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

springmvc配置

<bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 资源映射:因为servlet-mapping会拦截所有请求.需要过滤掉静态资源请求 -->
    <mvc:resources location="/WEB-INF/css/" mapping="/css/**" />
    <mvc:resources location="/WEB-INF/js/" mapping="/js/**" />

过滤器代码

@Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        HttpServletResponse httpServletResponse = (HttpServletResponse) response;
        String urlPath = httpServletRequest.getRequestURL().toString();
        String value = jedisClient.get("key1");
        System.out.println(urlPath+"---"+value);
        if (value !=null) {
            chain.doFilter(request, response);
        }else{
            httpServletResponse.sendRedirect(urlPath + loginPage);
        }
    }

    @Override
    public void init(FilterConfig config) throws ServletException {
        //context-param –> listener –> filter –> servlet
        loginPage = config.getInitParameter("loginPage");
        ServletContext context = config.getServletContext();
        ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(context);
        jedisClient = (JedisClient) ctx.getBean("jedisClient");
    }

输入localhost:8080进入过滤器后直接死循环了.
求大神指点

解决方案

是不是大神都不屑回答这种问题.小白真心求解答

解决方案二：

  应该是下面这句有问题，在不停的重定向。监控下value值。要是每次都为null的话定会死循环。

    if (value !=null) {
            chain.doFilter(request, response);
        }else{
            httpServletResponse.sendRedirect(urlPath + loginPage);
        }